Question

[Dương Nghiên Đình]

tính giá trị biểu thức sau bằng cách hợp lí

-3/11 . (-22)/66 . 121/15

3/7 . 2/5 . 7/3 . 20 .19/72

6/7 . 8/13 + 6/13 . 9/7 - 3/13 . 6/7

-1/4 . 152/11 + 68/4 . (-1)/11

-5/7 . 2/11 + (-5)/7 . 9/11 + 12/7

146/13 - (18/7 + 68/13)

giải giúp mình nhé, cảm ơn nhiều

Answer 1

[Trinh Song Thu]

-3/11.(-22)/66.121/15

=(-3).(-22).121

 11.66.15

=11

15

3/7.2/5.7/3.20.19/72

=3.2.7.20.19

7.5.3.72

=76

16

6/7.8/13+6/13.9/7-3/13.6/7

=6/7.8/13+6/7.9/13-3/13.6/7

=6/7.(8/13+9/13-3/13)

=6/7.14/13

=12/13

-1/4.152/11+68/4.(-1)/11

=152/4.(-1)/11+68/4.(-1)/11

=(-1)/11.(152/4+68/4)

=(-1)/11.220/4

=-110/22

-5/7.2/11+(-5)/7.9/11+12/7

=-5/7.2/11+-5/7.9/11+12/7

=-5/7.(2/11+9/11)+12/7

=-5/7.1+12/7

=(-5)/7+12/7

=7/7

=1

146/13-(18/7+68/13)

=146/13-18/7-68/13

=(146/13-68/13)-18/7

=78/13-18/7

=6-18/7

=42/7-18/7

=24/7